//服务的主程序
var createError = require('http-errors');
var express = require('express');
var path = require('path');
var cookieParser = require('cookie-parser');
var logger = require('morgan');

//导入路由模块
var indexRouter = require('./routes/index');
var usersRouter = require('./routes/users');

//创建服务对象
var app = express();


//设置模块引擎和视图位置(view engine setup) 
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'ejs');

//配置服务特征
app.use(logger('dev'));
app.use(express.json());
app.use(express.urlencoded({ extended: false }));
app.use(cookieParser());
//设置静态资源的位置
app.use(express.static(path.join(__dirname, 'public')));

//设置跨域
app.use(function(req,res,next){
  res.header("Access-Control-Allow-Origin","*");
  res.header("Access-Control-Allow-Headers","*");
  next();
})

require('./config/token.js').tokenInterceptor(app)

//拦截请求，指定路由
app.use('/', indexRouter);
app.use('/users', usersRouter);

// 404和内部异常返回的信息(catch 404 and forward to error handler)
app.use(function(req, res, next) {
  next(createError(404));
});

// 返回异常的内容(error handler)
app.use(function(err, req, res, next) {
  // (set locals, only providing error in development)
  res.locals.message = err.message;
  res.locals.error = req.app.get('env') === 'development' ? err : {};

  // render the error page
  res.status(err.status || 500);
  res.render('error');
});

module.exports = app;
